SELinux does not contain rules to support the ISPConfig apache webserver on port 81 and several other scripts. Ify ou enable SELinux, ISPConfig wont work anymore.

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This is not quite true. According to CentOS WiKi:

5.4. Allowing Access to a Port
We may want a service such as Apache to be allowed to bind and listen for incoming connections on a non-standard port. By default, the SELinux policy will only allow services access to recognized ports associated with those services. If we wanted to allow Apache to listen on tcp port 81, we can add a rule to allow that using the 'semanage' command:

Code:

# semanage port -a -t http_port_t -p tcp 81

A full list of ports that services are permitted access by SELinux can be obtained with:

Code:

# semanage port -l

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It will be very nice if ISPCONFIG will work, at least at some point in future with SELINUX.